Although Guan Ping mainly cultivates Inner Qi, his body is intensely imbued with Heaven and Earth Essence, far surpassing the average Qi Cultivation of a military general, even if not as advanced as Advanced Cultivation.
Likewise, regarding the divine direction, perhaps Guan Ping has deciphered the shadows, his Will fluctuations mesh perfectly with his Spirit fluctuations, directly infused into the Heaven and Earth Essence, which means his Divine Attribute directly merged into his Inner Qi.
As for Inner Qi, there's not much to say. He is already approaching the Inner Qi Manifestation Perfection Level. In the past, he was like Sun Ce, Ma Chao, those extraordinary people who reached the peak level of Qi Refining to Gang at the age of fifteen or sixteen.
